Abstract
The paper considers such modifications of an ordinary pulse-forming line (PFL) as double-width and triple-width forming lines (DWFL, TWFL) built around the PFL by nesting one and two additional uncharged lines, respectively, into its free volume inside the inner conductor of the PFL. The theoretical analysis is supported by simulation and experimental data, showing that the TWFL provides a 3-fold increase in the voltage pulse width and that it can be further increased by an arbitrary integer factor k. The results of the numerical simulations also show the electric field behavior and other features, including the edge effect in the TWFL. The proposed method opens up new opportunities for designing compact high-power microwace (HPM) sources.
Highlights
High-voltage drivers based on distributed pulse-forming lines (PFLs) [1] are an excellent power supply for high-power microwave (HPM) oscillators
This type of driver can provide relatively short rise times and rectangular voltage pulses that are, in all respects, more beneficial than those formed by Marx generators or modular pulse-forming networks (PFNs) [2]
Our attention was focused on pulse extension, for which we further developed the fruitful idea of pulse width doubling [23] by using an additional, uncharged inner line
Summary
High-voltage drivers based on distributed pulse-forming lines (PFLs) [1] are an excellent power supply for high-power microwave (HPM) oscillators. This type of driver can provide relatively short rise times (of a few nanoseconds) and rectangular voltage pulses that are, in all respects, more beneficial than those formed by Marx generators or modular pulse-forming networks (PFNs) [2]. PFN Marx design that provides a pulse rise time of 5 ns at an output voltage of 400 kV in a beam diode of 100 Ω (burst mode operation for 10 s at 100 Hz) [3]. Shortening the voltage rise decreases the microwave oscillator transit time [11] and increases the efficiency of the beam-to-wave energy conversion [13,14]
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